Riveting tool



Aug. 31, 1943. R. a. NELSON 2,328,391

RIVETING TOOL Filed Dec. 22, 1941 WITNESSES,- INVENTOR.

ATTORNEYS s is loosely mounted a hammer I2.

Patented Aug. 31, 1943 UNITED STATES PATENT OFFICE mva'rmo TOOL Raymond E. Nelson, Seattle, Wash. Application December 22, 1941, Serial No. 424,040 1 Claim. (Cl. rag-53.5)

My invention relates to the art of riveting and has among its objects and advantages the provision of an improved rivet tool.

Riveted joints are frequently defective because oi the fact that the members riveted together are not drawn into firm engagement one with the other. In forming the rivet head, the rivet tends to swell. Unless the members riveted together lie in firm engagement one with the other, such swelling swells between the spaced members of the work and results in a defective joint, since i the members of the work can not be drawn into firm engagement. Accordingly, an object of my invention is to provide a riveting tool so designed as to bring the members of the work into firm engagement one with the other and simultaneously swell the :rivet so as to holdthe work members in firm Figure 6 is a modified form of the invention.

with the rivet 40 by reason of the spring 28. Such engagement between the hammer end and the rivet imparts swelling distortion to the rivet for firmly securing'the members 42 and 44 in engagement. Spring 28 is of sumcient tensionto hold the hammer end firmly against the rivet, al-

though the hammer I2 is driven inwardly of the body I0 at each blow of the rivet hammer but the springt28returns the hammer I2 into engagement with the rivet before the next air ham- In the embodiment selected for illustration,

I make use of a tubular body I0 within which Body III is constricted to provide a smaller diameter tubular neck I4, and the hammer I2 is provided with a body I6 fitting loosely in the larger diameter portion, I8 of the body III. A shaft-like hammer end 20 is provided on the body I6, which hammer end fits loosely inside the neck I4, Thus the hammer I2 includes a shoulder-like formation 22 arranged to abut the taper 24 connecting the portions I4 and I8 of the body I0.

Between the body portion I6 and a plug 26 is interposed a compression spring 28. Plug 26 is provided with a threaded shank 30 threaded into the internally threaded body portion III. A set screw 32 is threaded into the body portion I6for engagement with the shank 30 to prevent accidental loosening thereof. Figure 1 illustrates the rivet-engaging end 34 01 the hammer end 20 as terminating slightly inwardly of the workengaging end face 36 of the neck portion I4. The work-engaging end of the neck portion is preferably provided with a flange 38 to increase the area of the face 36.

In operation, the rivet 40 is placed in position in the aligned openings in the work members 42 and 44. The head 46 of the rivet lies adjamer blow is struck.

When once the rivet 40 has been swollen to bring the members 42 and 44 into firm engagement, the rivet head may be formed in the usual manner. The tool is designed in different sizes to handle rivets of variablesizes.

In Figure 6, I illustrate the bore 50 corresponding to the bore 48 as being flared toprovide accommodation for dimpled metal, wherein laterally ofiset margins of the work have interfitting engagement.

Without further elaboration, the foregoing will so fully illustrate my invention, that others may, by applying current knowledge, readily adapt the same for use under various conditions of service.

I claim:

A riveting tool comprising a tube, a tubular axial neck at one end of said tube of smaller inside diameter than the tube providing a shoulder between the tube and the neck, said neck having a work engaging face circumjacent the opening in the neck to engage the work circumjacent a rivet extended through the work and normally holding said second-mentioned shoulder in engagement with said first-mentioned shoul- 

